518 



Among the species kindly communicated to rae by Foslie there 

 are several that accord nearly with C. gregarium Al. Braun in re- 

 gard lo the shape of the elub-head. I think I ought to point out 

 this faet because it shows that C. longipes is a species very slightly 

 differentiated from C. gregarium«. I may further re- 

 mark that among the very rich material which I had 

 for examination from the Færoes sorae specimens 

 were found which appeared to correspond exactly 

 with C. Nordenskioldianum Kjellm. On the whole I 

 think that Kjellman is right when he says in his 

 description of C. Nordenskioldianum in N. I., p. 390 

 (318 — 9) that the genus Codiolum has been shown to 

 possess a great many species differing very slightly 

 from one another, which perhaps ought properly to 

 be referred to the same species. On examining the 

 specimens in the different Alg. Exsicc. at my dispo- 

 sal I have, however, arrived at the conclusion that it 

 is most natural to maintain the two first-described 

 species, C. pusillum and C. gregarium 1 which are in 

 faet fairly different from each other and I should 

 propose to refer the other species to these as re- 

 presenting different forms of one or the other. 



The head of the Færoese specimens measured 

 about 135 — 150 ,u in length and 54/;, in breadth and 

 the stem about 250 ft in length and 15 (i in breadth. 

 This plant has been found on sheltered as well 

 as on open coasts ; it grows in the littoral zone near 

 high-water mark or above it, and forms a thin, 

 green, slimy covering on rocks, pales or such like 

 piaces often in association with Prasiola, Urospora 

 mirabilis, Ulothrix, etc. 

 Specimens bearing zoospores were found in June, October, No- 

 vember and December and the plant occurred, on the whole, most 

 abundanlly in October, November and December. 



This species has hecn found in the following piaces: — Vid.: 

 Kvannesund (II.. I.); S tr.: Thorshavn (H.J.!); Store Dimon (!); Syd.:Tran- 

 gisvaagfjord several piaces (H. .1.), Famien (!). 



197. C. pusillum (Lyngb.) Kjellm., N. I., p. 389 (318); Vaucheria 

 pusilla Lyngb., Hydrophyt., p. 79, lab. 22. 



1 Naturally with the exception of Codiolum Petrocelidis Kuck. 



Fig. 107. Codiolum pu- 

 sillum (Lyngb.) Kjellm. 

 40: 1. 



